Vol 62, No 5 (2019)

The carbon structure of intact and demineralized coal of different metamorphic development is studied by Raman spectroscopy. After removing the mineral component of coal, the defect content of the carbon framework is decreased, and its structure is enriched with graphite-like fragments. Demineralization of the initial samples results in similar structure of the carbon framework, regardless of the metamorphic stage of the coal; the ratio of the integral intensities of the D and G bands is 0.78 ± 0.03.

Laboratory coking of experimental batch simulating the industrial batch at OAO Altai-Koks provides the basis for a model predicting the quality (CSR, CRI) of laboratory coke on the basis of the coking indices \(C{{I}^{{{{V}_{{\text{o}}}}}}}\) and CI. The relation derived between the quality (CSR, CRI) of the laboratory coke and the quality (CSR, CRI) of industrial coke produced by wet and dry quenching permits prediction of CSR,CRI for the industrial coke on the basis of predicted or experimental CSR and CRI values for the laboratory coke. This approach permits ongoing determination of the CSR and CRI values of industrial coke produced with wet and dry quenching in the following circumstances: (i) in correcting production batch on the basis of the coal components available in the store and other nearby coal resources; (ii) in correcting production batch by means of outside concentrates not currently available at the plant; (iii)in analysis of the reasons for quality changes of the coke at any moment; (iv) in developing promising batches as the market for coking coal changes.

The utilization of flammable wastes in composite fuels for boiler combustion is discussed. The combustible materials considered are coal flotation wastes, long-flame coal, sawdust, and cardboard. These components undergo combustion in the form of a bed of dry mixture or as aqueous suspensions. The following characteristics are determined: the minimum ignition temperature, the delay time of gaseous or heterogeneous ignition, the maximum temperature in the combustion zone, and the calorific value of the fuels. Sawdust-based compositions may be recommended for kindling and to minimize the ignition time. The heat liberation in the combustion chamber may be significantly increased by using mixtures of sawdust, coal slurry or filter cake, and coal dust. The use of such wastes as industrial fuels is very promising.